class_docstr: Dictionary which uses normalized URIs as keys.
code: def __getitem__(self, uri):
      return self.store[self.normalize(uri)]
  
imports: import itertools
  import json
  import pkgutil
  import re
  from jsonschema.compat import MutableMapping, str_types, urlsplit
label_desc: Use image node_id 3 for calling the URIDict obj's underlying member method code with example usage: obj.__getitem__(uri) and returns: self